xcode - 觸摸移動

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第一步 建立一個UIView類  命名MoveView

#import "MoveView.h"@implementation MoveView/** 移動事件*/-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    UITouch * touch = [touches anyObject];    CGPoint curp=[touch locationInView:self];    CGPoint preP=[touch previousLocationInView:self];        self.transform = CGAffineTransformTranslate(self.transform, curp.x-preP.x, curp.y-preP.y);}@end

 

在ViewController 裡面的代碼有注釋

#import "ViewController.h"#import "MoveView.h"@interface ViewController ()//定義個自訂UIView@property(nonatomic, weak) MoveView * Uview;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    //建立一個UIView    MoveView * mView = [[MoveView alloc]initWithFrame:CGRectMake(20, 20, 100, 100)];    //設定背景顏色    mView.backgroundColor = [self randomColor] ;    //建立一個定時器    [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(click) userInfo:nil repeats:YES];    self.Uview = mView;    //加入控制項    [self.view addSubview:mView];}/** 重繪圖行 */-(void)click{    self.Uview.backgroundColor = [self randomColor];}/** 生產隨機顏色 */- (UIColor *)randomColor{    return [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1];}@end

 

xcode - 觸摸移動